Gateway Address

  2 minute read  

The Gateway API provides an optional Addresses field through which Envoy Gateway can set addresses for Envoy Proxy Service. Depending on the Service Type, the addresses of gateway can be used as:

Prerequisites

Follow the steps below to install Envoy Gateway and the example manifest. Before proceeding, you should be able to query the example backend using HTTP.

Expand for instructions

  1. Install the Gateway API CRDs and Envoy Gateway using Helm:

    helm install eg oci://docker.io/envoyproxy/gateway-helm --version v1.3.0 -n envoy-gateway-system --create-namespace

  2. Install the GatewayClass, Gateway, HTTPRoute and example app:

    kubectl apply -f https://github.com/envoyproxy/gateway/releases/download/v1.3.0/quickstart.yaml -n default

  3. Verify Connectivity:

    You can also test the same functionality by sending traffic to the External IP. To get the external IP of the Envoy service, run:

    export GATEWAY_HOST=$(kubectl get gateway/eg -o jsonpath='{.status.addresses[0].value}')

    Note: In certain environments, the load balancer may be exposed using a hostname, instead of an IP address. If so, replace ip in the above command with hostname.

    Curl the example app through Envoy proxy:

    curl --verbose --header "Host: www.example.com" http://$GATEWAY_HOST/get

    Get the name of the Envoy service created by the example Gateway:

    export ENVOY_SERVICE=$(kubectl get svc -n envoy-gateway-system --selector=gateway.envoyproxy.io/owning-gateway-namespace=default,gateway.envoyproxy.io/owning-gateway-name=eg -o jsonpath='{.items[0].metadata.name}')

    Port forward to the Envoy service:

    kubectl -n envoy-gateway-system port-forward service/${ENVOY_SERVICE} 8888:80 &

    Curl the example app through Envoy proxy:

    curl --verbose --header "Host: www.example.com" http://localhost:8888/get

External IPs

Using the addresses in Gateway.Spec.Addresses as the External IPs of Envoy Proxy Service, this will require the address to be of type IPAddress and the ServiceType to be of LoadBalancer or NodePort.

The Envoy Gateway deploys Envoy Proxy Service as LoadBalancer by default, so you can set the address of the Gateway directly (the address settings here are for reference only):

kubectl patch gateway eg --type=json --patch '
- op: add
  path: /spec/addresses
  value:
   - type: IPAddress
     value: 1.2.3.4
'

Verify the Gateway status:

kubectl get gateway

NAME   CLASS   ADDRESS   PROGRAMMED   AGE
eg     eg      1.2.3.4   True         14m

Verify the Envoy Proxy Service status:

kubectl get service -n envoy-gateway-system

NAME                            TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
envoy-default-eg-64656661       LoadBalancer   10.96.236.219   1.2.3.4       80:31017/TCP   15m
envoy-gateway                   ClusterIP      10.96.192.76    <none>        18000/TCP      15m
envoy-gateway-metrics-service   ClusterIP      10.96.124.73    <none>        8443/TCP       15m

Note: If the Gateway.Spec.Addresses is explicitly set, it will be the only addresses that populates the Gateway status.

Cluster IP

Using the addresses in Gateway.Spec.Addresses as the Cluster IP of Envoy Proxy Service, this will require the address to be of type IPAddress and the ServiceType to be of ClusterIP.


Last modified February 21, 2025: feat: support HPA in helm chart (#5127) (57c7e64)